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Simulation of embedment phenomena on bamboo culms via a modified foundation modelling approach

机译：通过改进的基础建模方法模拟竹秆嵌入现象

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This study establishes a modified foundation modelling approach to macroscopically capture the embedment phenomena in bolted bamboo connections. The proposed approach assumes that the material properties of the foundation zone are the nominal embedment properties, and defines the dimensions of the foundation zone such that its displacement at a stress level corresponding to the embedment strength equals the experimental yield displacement. The study develops models for non-predrilled and for predrilled embedment specimens. The model results exhibit good agreement with original experimental results of dowel bearing tests parallel to grain of Kao Jue (Bambusa pervariabilis) bamboo culms, both in terms of average stiffness and average strength. A parametric analysis investigates the effect of mesh size and bolt-specimen contact friction coefficient on the model results. The analysis shows that higher friction coefficient produces higher embedment strength for the predrilled specimens, whereas it does not affect the non-predrilled specimen results. Mesh size slightly affects the apparent embedment strength in both cases. Lastly, an application of the modified foundation modelling approach to available experimental results of full-culm bamboo-to-steel connections confirms the methodology's ability to replicate the effect of embedment on bolted bamboo connections. (C) 2020 Elsevier Ltd. All rights reserved.
机译：本研究建立了一种改进的基础建模方法，以宏观地捕获螺栓竹连接中的嵌入现象。该方法假设基础区域的材料特性是标称嵌入性质，并限定基础区域的尺寸，使得其对应于嵌入强度的应力水平的位移等于实验产量位移。该研究开发了非预测和预倒数嵌入样本的模型。模型结果表现出与平行于平均刚度和平均力量的Kao Jue（Bambusa Pervariabilis）竹秆的销轴承测试的原始实验结果良好。参数分析研究了网格尺寸和螺栓样品接触摩擦系数对模型结果的影响。该分析表明，较高的摩擦系数为倾卸标本产生较高的嵌入强度，而它不会影响非预测的标本结果。网格尺寸略微影响两种情况下的表观嵌入力量。最后，改进的基础建模方法应用于全秆竹对钢连接的可用实验结果证实了方法论能力复制嵌入效果对螺栓竹连接的能力。 （c）2020 elestvier有限公司保留所有权利。

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